网络防火墙系统的实现（二）

淩亂°似流年 2022-08-18 12:29 85阅读 0赞

## 1. 主Activity文件 ##

首先编写文件MainActivity.java,此文件是整个系统的核心，能够实现服务勾选处理和模式设置功能，勾选后会禁止或开启某项网络服务。文件MainActivity.java的具体实现流程如下。

*  定义类MainActivity为项目启动后首先显示的Activity,设置按下Menu后显示的选项，并设置需要的各个实例函数。

public class MainActivity extends Activity implements OnCheckedChangeListener, OnClickListener \{

//按下Menu后显示的选项

private static final int MENU\_DISABLE = 0;

private static final int MENU\_TOGGLELOG = 1;

private static final int MENU\_APPLY = 2;

private static finall int MENU\_EDIT = 3;

private static final int MENU\_HELP = 4;

private static final int MENU\_SHOWLOG = 5;

private static final int MENU\_SHOWRULES = 6;

private static final int MENU\_CLEARLOG =7;

private static final int MENU\_SETPWD = 8;

//进展对话实例

private ListView listview;

public void onCreate( Bundle savedInstanceState) \{

super.onCreate(savedInstanceState);

checkPreferences();

setContentView(R.layout.main);

this.findViewById(R.id.label\_mode).setOnClickListenter(this);

Api.assertBinaries(this, true);

protected void onStart() \{

super.onStart();

Log.d("DroidWall","onStart() - Forcing APP list reload!");

Api.applications =null;

protected void onResume() \{

super.onResume();

if(this.listview == null) \{

this.listview = (ListView) this.findViewById(R.id.listview);

refreshHeader();

final String pwd = getSharedPreferences(Api.PREFS\_NAME, 0).getString( Api.PREF\_PASSWORD, "");

if (pwd.length() == 0) \{

showOrLOadApplication();

\} else \{

requestPassword(pwd);

protected void onPause() \{

super.onPause();

this.listview.setAdapter(null);

*  定义函数checkPreferences()检查被存放的选项正常，具体代码如下所示：

//检查被存放的选项正常

private void checkPreferences() \{

final SharedPreferences prefs = getSharedPreferences( APi.PREFS\_NAME, 0);

final Editor editor = prefs.edit();

boolean changed = false;

if (prefs.getString(Api.PREF\_MODE, "").length() == 0) \{

editor.putString( Api.PREF\_MODE, Api.MODE\_WHITELIST);

changed = true;

//删除旧的选项名称

if (prefs.contains("AllowedUids"))  \{

editor.remove("AllowedUids");

changed = true;

if (prefs.contains("Interfaces")) \{

editor.remove("Interfaces");

changed = true;

if (chabged)

editor.commit();

*  定义函数refreshHander()来刷新显示当前运行和网络相关的程序，具体代码如下所示：

private void refreshHeader() \{

final SharedPreferences prefs = getSharedPreferences(Api.PREFS\_NAME,0);

final String mode = prefs.getString(Api.PREF\_MODE, Api.MODE\_WHITELIST);

final TextView labelmode = (TextView) this.findViewById(R.id.label\_mode);

final Resources res = getResources();

int resid = (mode.equals(Api.MODE\_WHITELIST)? R.string.mode\_whitelist : R.string.mode\_blacklist);

labelmode.setText( res.getString (R.string.mode\_header, res.getSTring(resid)));

resid = (Api.isEnabled(this) ? R.string.title\_enabled : R.string.title\_disabled);

setTitle (res.getSting (resid, Api.VERSION));

*  定义函数selectMode()显示对话框选择操作方式，供我们选择黑名单模式还是白名单模式。

private void selectMode() \{

final Resources res = getResources();

new ALertDialog.Builder(this)

.setItems(

new String\[\] \{ res.getString(R.string.mode\_whitelist),

res.getString( Rstring.mode\_blacklist.) \},

new DialogInterface.OnClickListener() \{

public void onClick(DialogInterface dialog, int which) \{

final String mode = (which == 0? Api.MODE\_WHITELIST : Api.MODE\_BLACKLIST);

final Editor editor = getSharedPreferences( Api.PREFS\_NAME, 0).edit();

editor.putString(Api.PREF\_MODE, mode);

editor.commit();

refreshHeader();

\}).setTitle("Select mode:").show();

*  定义函数setPassword()来设置一个系统密码，如果设置密码后，在进入主界面前会通过函数requestPassword()来验证密码，只有密码正确才能进入。

//设置一新的密码

private void setPassword (String pwd) \{

final Resources res = getResources();

final Editor editor = getSharedPreferences( Api.PREFS\_NAME, 0).edit();

editor.putString( Api.PREF\_PASSWORD,pwd);

String msg;

if (editor.commit()) \{

if(pwd.length() > 0) \{

msg = res.getString( R.string.passdefined);

\} else \{

msg = res.getString(R.string.passremoved);

Toast.makeText( MainActivity.this, msg, Toast.LENGTH\_SHORT).show.();

//如果设置了密码，显示主界面前先验证密码

private void requestPassword( final String pwd) \{

new PassDIalog( this, false, new android.os.Handler.callback() \{

public boolean handleMessage( Message msg) \{

if (msg.obj == null) \{

MainActivity.this.finish();

android.os.Process.killProcess( android.os.Process.myPid());

return false;\}

if ( !pwd.equals(msg.obj)) \{

requestPassword(pwd);

return false;

//如果密码正确

showOrLoadApplications();

return false;

\}).show();

*  编写函数toggleLogEnabed()实现防火墙禁用和日志禁用开关处理。

private void toggleLogEnabled() \{

final SharedPreferences prefs = getSharedPreferences(Api.PREFS\_NAME, 0 );

final boolean enabled = !prefs.getBollean(Api.PREF\_LOGENABLED, false);

final Editor editor = prefs.edit();

editor.putBoolean(Api.PREF\_LOGENABLED, enabled);

editor.commit();

if(Api.isEnabled(this)) \{

Api.applySavedIptablesRules(this, true);

Toast.makeText(

MainActivity.this,

(enabled? R.string.log\_was\_enabled: Rstring.log\_was\_disable),

Toast.LENGTH\_SHORT).show();

*  编写函数showOrLoadApplication(),如果在某模式下有应用则显示里面的应用。

private void showOrLoadApplications() \{

final Resources res = getResources();

if(Api.applications == null) \{

final ProgressDialog progress = ProgressDialog.show(this,

res.getString(R.string.working), res.getString(R.string.reading\_apps), true);

final Handler handler = new Handler() \{

public void handleMessage (Message msg) \{

try \{

progress.dismiss();

\} catch (Exception ex) \{

showApplications();

\};

new Thread() \{

public void run() \{

Api.getApps(MainActivity.this);

handler.sendEmptyMessage(0);

\}.start();

\} else \{

//储藏应用，显示名单

showApplications();

*  编写showApplications()显示应用名单

private void showApplications() \{

final DroidApp\[ \] apps = Api.getApps(this);

Arrays.sort( apps, new Comparator<DroidApp>() \{

public int compare (DroidApp o1, DroidApp o2) \{

if ((o1.selected\_wifi | o1.selected\_3g) == (o2.selected\_wifi | o2.selected\_3g)) \{

return String.CASE\_INSENSITIVE\_ORDER.compare (o1.name\[0\], o2.names\[0\]);

if (o1.selected\_wifi || o1.selected\_3g)

return -1;

return 1;

\});

final LayoutInflater inflater = getLayoutInflater();

final LIstAdapter adapter = new ArrayAdapter<DroidApp> (this, R.layout.listitem, R.id.app\_text, apps) \{

public View getView (int position, View contertView, ViewGroup parent) \{

ListEntry entry;

if (convertView == null) \{

convertView = inflater.inflate (R.layout.listitem, parent, false);

entry = new ListEntry();

entry.box\_wifi = (CheckBox) convertView.findViewById(R.id.itemcheck\_wifi);

entry.box\_3g = (CheckBox) convertView.findViewById(R.id.itemcheck\_3g);

entry.app\_text = (TextView) convert.findViewById(R.id.app\_text);

entry.upload = (TextView) convertView.findViewById(R.id.upload);

entry.download = (TextView) convertView.findViewById(R.id.download);

convertView.setTag(entry);

entry.box\_wifi.setOnCheckedChangeListener( MainActivity.this);

entry.box\_3g.setOnCheckedChangeListener( MainActivity.this);

\} else \{

//转换一个现有视图

final DroidApp app = apps \[position\];

entry.app\_text.setText( app.toString());

convertAndSetColor (TrafficStats.getUidTxBytes( app.uid), entry.upload);

convertAndSetColor (TrafficStats.getUidRxBytes( app.uid), entry.download);

final CheckBox box\_wifi = entry.box\_wifi;

box\_wifi.setTag(app);

box\_wifi.setChecked (app.selected\_wifi);

final CheckBox box\_3g = entry.box\_3g;

box\_3g.setTag(app);

box\_3g.setChecked (app.selected\_3g);

return convertView;

*  编写函数convertAndSetColor(), 根据对某选项的设置显示内容，并设置显示内容的颜色。假如没有任何设置，则显示“N/A”，如果已经设置了启用 则显示已经用过的流量。

private void convertAndSetColor( long num, TextView text) \{

String value = null;

long temp = num;

float floatnum = num;

if( num == -1) \{

value = "N/A";

text.setText(value);

text.setTextColor(0xff919191);

return;

\} else if ((temp = temp/1024) < 1) \{

value = num + "B";

\} else \{

value = temp + "KB";

\} else \{

DecimalFormat format = new DecimalFormat ("\#\#0.0");

value = format.format( floatnum) + "MB";

text.setText(value);

text.setTextColor(0xffff0300);

\};

this.listview.setAdapter(adapter);

*  进入系统主界面后，如果按下MENU键则会弹出设置界面，在设置界面中可以选择对应的功能。

public boolean onCreateOptionsMenu( Menu menu) \{

menu.add( 0, MENU\_DISABLE, 0, R.string.fw\_enabled).setIcon( android.R.drawable.button\_onoff\_indicator\_on);

menu.add( 0, MENU\_TOGGLELOG, 0, R.string.log\_enabled).setIcon( android.R.drawable.button\_onoff\_indicator\_on);

menu.add( 0, MENU\_APPLY, 0, R.string.applyrules).setIcon(R.drawable.apply);

menu.add( 0, MENU\_EXIT, 0, R.string.eixt).setIcon( android.R.drawable.ic\_menu\_close\_clear\_cancel);

menu.add( 0, MENU\_HELP, 0, R.string.help).setIcon( android.R.drawable.ic\_menu\_help);

menu.add( 0, MENU\_SHOWLOG, 0, R.string.show\_log).setIcon(R.drawable.show);

menu.add( 0, MENU\_SHOWRULES, 0, R.string.showrules).setIcon(R.drawable.show);

menu.add( 0, MENU\_CLEARLOG, 0, R.string.clear\_log).setIcon(android.R.drawable.ic\_menu\_close\_clear\_cancel);

menu.add( 0, MENU\_SETPWD, 0, R.string.setpwd).setIcon(android.R.drawable.ic\_lock\_lock);

return;

public boolean onPrepareOptionMenu( Menu menu) \{

final MenuItem item\_onoff = menu.getItem( MENU\_DISABLE);

final MenuItem item\_apply = menu.getItem( MENU\_APPLY);

final boolean enabled = Api.isEnabled(this);

if (enabled) \{

item\_onoff.setIcon( android.R.drawable.button\_onoff\_indicator\_on);

item\_onoff.setTitle( R.string.fw\_enabled);

item\_apply.setTitle( R.string.applyrules);

\} else \{

item\_onoff.setIcon( android.R.drawable.button\_onoff\_indicator\_off);

item\_onoff.setTitle( R.string.fw\_disabled);

item\_apply.setTitle( R.string.saverules);

final MenuItem item\_log = menu.getItem( MENU\_TOGGLELOG);

final boolean logenabled = getSharedPreferences( Api.PREFS\_NAME, 0).getBoolean( Api.PREF\_LOGENABLED, false);

if (logenabled) \{

item\_log.setIcon( android.R.drawable.button\_onoff\_indicator\_on);

item\_log.setTitle( R.string.log\_enabled);

\} else \{

item\_log.setIcon( android.R.drawable.button\_onoff\_indicator\_off);

item\_log.setTitle( R.string.log\_disabled);

return super.onPrepareOptionMenu( menu);

public boolean onMenuItemSelected( int featureId, MenuItem item) \{

switch (item.getItemId()) \{

case MENU\_DISABLE:

disableOrEnable();

return true;

case MENU\_TOGGLELOG:

toogleLogEnabled();

return true;

case MENU\_APPLY:

applyOrSaveRules();

return true;

case MENU\_EIXT:

finish();

System.exit( 0);

return true;

case MENU\_HELP:

new HelpDIalog(this).show();

return true;

case MENU\_SETPWD:

setPassword();

return true;

case MENU\_SHOWLOG:

showLog();

return true;

case MENU\_SHOWRULES:

showRules();

return true;

case MENU\_CLEARLOG:

clearLog();

return true;

return false;

*   编写函数disableOrEnable()设置开启或关闭防火墙

private void disableOrEnable() \{

final boolean enabled = !Api.isEnabled( this);

Log.d ("DriodWall", "Changing enabled status to: " + enabled);

Api.setEnabled( this, enabled);

if (enabled) \{

applyOrSaveRules();

\} else \{

purgeRules();

refreshHeader();

*  编写函数setPassword来设置密码界面

private void setPassword() \{

new PassDialog (this, true, new android.os.Handler.Callback() \{

public boolean handleMessage (Message msg) \{

if (msg.obj != null) \{

setPassword( (String) msg.obj);

return false;

)

\}).show();

*  选择“Save rules(保存规则)”后执行函数showRules()

private void showRules() \{

final Resources res = getResources();

final ProgressDialog progress = ProgressDialog.show( this, res.getString (R.string.working), res.getString( R.string.please\_wait), true);

final Handler handler = new Handler () \{

public void handleMessage( Message msg) \{

try \{

progress.dismiss();

\} catch (Exception ex) \{

if (! Api.hasRootAccess (MainActivity.this, true))

return;

Api.showIptablesRules (MainActivity.this);

\};

handler.sendEmptyMessageDelayed( 0, 100);

*  编写函数showLog()显示日志信息界面

private void showLog() \{

final Resources res = getResources();

final ProgressDialog progress = ProgressDialog.show( this, res.getString( R.string.working), res.getString( R.string.please\_wait), true);

final Handler handler = new Handler() \{

public void handleMessage (Message msg) \{

try \{

progress.dismiss();

\} catch (Exception ex) \{

Api.showLog( MainActivity.this);

\};

handler.sendEmptyMessageDelayed( 0, 100);

*  编写函数clearLog()清除系统内的日志记录信息

private void clearLog() \{

final Resources res = getResources();

final ProgressDIalog progress = ProgressDIalog.show( this, res.getString( R.string.working), res.getString( R.string.please\_wait), true);

final Handler handler = new Handler() \{

public void handlerMessage( Message msg) \{

try \{

progress.dismiss();

\} catch (Exception ex) \{

if (!Api.hasRootAccess (MainActivity.this, true))

return;

if (Api.clearLog( MainActivity.this)) \{

Toast.makeText( MainActivity.this, R.string.log\_cleared, Toast.LENGTH\_SHORT).show();

\};

handler.sendEmptyMessageDelayed(0, 100);

*  编写函数applyOrSaveRules(),当申请或保存规则后将规则运用到本系统

private void applyOrSaveRules() \{

final Resources res = getResources();

final boolean enabled = Api.isEnabled( this);

final ProgressDialog progress = ProgressDialog.show( this, res.getString( R.string.working), res.getString( enabled ? R.string.applying\_rules: R.string.saving\_rules), true);

final Handler handler = new Handler() \{

public void handleMessage( Message msg) \{

try \{

progress.dismiss();

\} catch( Exception ex) \{

if (enabled) \{

Log.d ("DroidWall", "Applying rules.");

if (Api.hasRootAccess( MainActivity.this, true) && Api.applyIptablesRules (MainActivity.this ,true)) \{

Toast.makeText (MainActivity.this, R.string.rules\_applied, Toast.LENGTH\_SHORT).show();

\} else \{

Log.d ("DroidWall", "Failed - Disabling firewall.");

Api.setEnabled( MainActivity.this, false);

\} else \{

Log.d ("DroidWall", "Saving rules.");

Api.saveRules( MainActivity.this, R.string.rules\_saved, Toast.LENGTH\_SHORT).show();

\};

handler.sendEmptyMessageDelayed( 0, 100);

*  编写函数purgeRules()来清除一个规则

private void purgeRules() \{

final Resources res = getResources();

final ProgressDialog progress = ProgressDialog.show (this, res.getString( R.string,working), res.getString( R.string.deleting\_rules), true);

final Handler handler = new Handler() \{

public void handleMessage( Message msg) \{

try \{

progress.dismiss();

\} catch (Exception ex) \{

if (!Api.hasRootAccess (MainActivity.this, true))

return;

if (!Api.purgeIptables( MainActivity.this, true)) \{

Toast.makeText (MainActivity.this, R.string.rules\_deleted, Toast.LENGTH\_SHORT).show();

\};

handler.sendEmptyMessageDelayed( 0, 100);

*  编写函数onCheckedChanged()检查WI-FI选项和3G选项是否发送变化

public void onCheckedChanged (CompoundButton buttonView, boolean isChecked) \{

final DroidApp app = (DroidApp) buttonView.getTag();

if (app != null) \{

switch (buttonView.getId()) \{

case R.id.itemcheck\_wifi:

app.selected\_wifi = isChecked;

break;

case R.id.itemcheck\_3g:

app.selected\_3g = isChecked;

break;

到目前为止，主界面程序介绍完毕，关于string.xml文件里string内容的定义我这边就不列拉。

网络防火墙系统的实现（二）

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